XML 92 R78.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stockholders' Equity - Additional Information (Detail)
 12 Months Ended
Apr. 19, 2016
Dec. 31, 2017
USD ($)
Director
$ / shares
shares
Dec. 31, 2016
USD ($)
Employee
Director
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Stockholders Equity [Line Items]        
Incremental fair value of modified award | $   $ 451,000 $ 469,000 $ 2,411,000
Requisite service period reorganization of stock on strait-line basis     3 years  
Term of historical volatility of common stock   6 years    
Number of shares converted   1,500,000    
2017 Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Restricted stock, vesting percentage   100.00%    
Restricted stock, vesting percentage per year   33.33%    
Restricted stock, vesting period   3 years    
2015 Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Restricted stock, vesting percentage per year     33.33%  
Restricted stock, vesting period     3 years  
2016 Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Restricted stock, vesting percentage     100.00%  
Restricted stock, vesting percentage per year     33.33%  
Restricted stock, vesting period     3 years  
Restricted Stock [Member]        
Stockholders Equity [Line Items]        
Awards granted   469,465 850,771 584,959
Incremental fair value of modified award | $     $ 1,500,000  
Approximate grant date fair value | $   $ 3,124,000 $ 2,579,000 $ 405,000
Weighted average grant date fair value | $ / shares   $ 9.11 $ 7.82 $ 7.18
Number of shares vested   318,282    
Number of unvested restricted stock/restricted stock units outstanding   1,189,473 1,038,290  
Restricted Stock Units (RSUs) [Member]        
Stockholders Equity [Line Items]        
Approximate grant date fair value | $   $ 375,000    
Weighted average grant date fair value | $ / shares   $ 9.87 $ 13.56  
Vesting description   Vesting occurs upon the earliest to occur: (i) the director’s separation from service, (ii) the third anniversary of the grant date, or (iii) the occurrence of a change of control as defined by the agreement.    
Number of unvested restricted stock/restricted stock units outstanding   43,764    
Restricted Stock Units (RSUs) [Member] | Non Employee Directors [Member]        
Stockholders Equity [Line Items]        
Awards granted   37,992 27,654  
Number of directors separated form service | Director   2    
Number of board of directors | Director   9 11  
Number of shares vested   21,882    
Preferred Share Rights Plan [Member]        
Stockholders Equity [Line Items]        
Preferred share right plan description   If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time.    
Minimum percentage of ownership of common stock required to exercise preferred share rights   15.00%    
Exercise price of Preferred Stock   $47.75 per one one-hundredth of a share    
Redemption price preferred share rights | $ / shares   $ 0.01    
Maximum time for redemption after the Rights become exercisable   10 days    
Preferred share right exchange ratio   1    
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange   50.00%    
2016 Plan [Member]        
Stockholders Equity [Line Items]        
Long term incentive plan, effective date     Apr. 19, 2016  
Term of long term incentive plan 10 years      
Aggregate number of shares reserved and available for issuance   2,137,895 2,750,000  
Minimum exercise price of stock option at grant date   No less than 100% of the fair market value, as defined in the 2016 Plan, of the shares on the date of grant.    
Percentage of fair market value     100.00%  
Maximum term of stock option     10 years  
Options granted   0 0  
2008 Plan [Member]        
Stockholders Equity [Line Items]        
Awards granted     0  
Shares surrendered by the number of employees | Employee     4  
Number of shares surrendered by the employee during the period     280,000  
Total stock based compensation expense not yet recognized, relating to non-vested restricted stock and stock options | $   $ 9,514,000    
2008 Plan [Member] | 2015 Stock Options [Member]        
Stockholders Equity [Line Items]        
Number of shares of stock options granted       135,000
Options vest at a percentage rate for first 5 years       16.50%
Options final year vesting   end of the sixth year    
2008 Plan [Member] | 2015 Stock Options [Member] | Discontinued Operations [Member]        
Stockholders Equity [Line Items]        
Number of shares of stock options granted       5,000